DVD authoring: gprm(0) = 0

[Calimari]

When DVD Shrink re-authors a DVD (movie only), it sets gprm(0) to 0 in the precommands of the movie title.
Is there a reason for this, as gprm(0) isn't used anymore?
I wanna know this, because I wanna build a navigation myself on a particular disc.

[blutach]

When a DVD initialises, all gprms are zero. You can safely take this line out, unless gprm(0) is used elsewhere (eg as a counter where many titles are compiled).

Regards

[Calimari]

No, gprm(0) isn't used anymore, it's just initialised together with the audio and subtitle stream, in the precommands of the movie VTS. That's why I asked myself why. Anyway, thx for advice, I know now I don't have to do such thing when I build a navigation from scratch.

[blutach]

Any gprm that is used only once can be taken out.

Regards

[r0lZ]

Gprm 0 is used by Shrink in reauthor mode as an identifier of the last title that has been played.
In a reauthored DVD with only one title, it is useless.
If you make a compilation of several titles, it is assigned a different value for each title, and it is used in the First-Play PGC to play the next title automatically.

[Calimari]

thx rOLZ.

Btw, I'm playing with PgcEdit's Command Editor. Very nice feature, especially the 'Jump and Call' tab, which is an excellent guide to determine the right commands when building your own navigation.

[r0lZ]

Thanks!